fix on_offlice webhook crash by adding res.send()

authhook/on_offline.js

@@ -5,6 +5,9 @@ module.exports = function (options = {}) {
     return function (req, res, next) {
         console.log('auth_on_offline')
         doRedis(req.body.client_id)
+
+        res.status(200);
+        res.send('');
     }
 
     function doRedis(client_id) {